Benno Ammann’s oeuvre reveals influences from impressionism to free tonality, yet he belongs to no stylistic school. The Swiss composer wrote Missa Defensor Pacis (‘Defender of the Faith’) in 1946 for the official canonization, at St Peter’s in Rome, of Nicholas of Flüe, patron saint of Switzerland. This prestigious commission, with its complex polyphony, countless variations, and use of the cantus firmus technique, is one of the most important and extensive Masses by a Swiss composer for a cappella choir. The Basler Madrigalisten are one of the most traditional professional vocal ensembles in Switzerland and are primarily devoted to demanding repertoires from the Renaissance to contemporary music. The ensemble, founded in 1978 by Fritz Naf at the Schola Cantorum Basiliensis, has been under the direction of Raphael Immoos since 2013 and has toured Europe, the USA, Australia, and Asia.